Fuel-feeding device for internal-combustion engines



H. C SUEKERT.

FUEL FEEDING DEVICE FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED FEB- 3, I919.

1,356,096. Patented Oct. 19,1920.

3 HEETs-sHEET 1.

w M: IIIIII --=Q |I|I hmm I Hm mum I "I' IIII III 'II n I III IIIIIIIIII IIVI/E/I/TOR A TTOR/VEI amlz Gfaeierl H. C. SUEKERT. FUEL FEEDING DEVICE FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED FEB. 3. 1919.

1,356,096. Patented Oct. 19,1920.

3 SHEETSSHEET 2..

INVENTOR /70%? A TTORNEI H. c. SUEKERT. FUEL FEEDING DEVICE FOR INTERNAL COMBUSTION ENGINES. APPLICATION FILED FEB- 3, I9I9. 1,35 ,09 Patented Oct 19,1920.

3 SHEETS-SHEET 3= In M w M v 4 E: E 4

NW v :53 2:1

pumping action of the gas operated pump fuel HAROLD c. scan, or NEW YORK, N. Y.

FUELFEEDING DEVICE FOR INTERNAL-COMBUSTION ENGINESv.

Specification of Letters Patent.

Patented Oct. 19, 1920.,

' Application filed February 3, 1919. Serial No. 274.1752.

To all whom it may concern;

Be it known that I, HAROLD C. SUEKERT, a citizen of the United States, and a re'sident of the city, county, and State of New- York, have invented certain new and useful Improvements in Fuel-Feeding Devices for Internal-Combustion Engines, of which the following is a full, clear, concise, and exact description, such as will enableothers skilled in the art to' which the invention relates to make and use the same, reference being made therein to the accompanying drawings, which-form a part of this specification.

My invention relates to liquid fuel feeding devices for internal combustion engines of the type or class wherein pumping mechanism operated by gas under pressure derived from the cyl'nder of the engine is employed to supp y liquid fuel to the carbureter or equivalent device whereby a combustible mixture for use b the engine is produced, or wherein suc gas operated pumping mechanism is employed to supply liquid fuel directly to the working cylinder of the engine in case no carbureter is employed; and the object thereof is to provide gas operated pumping mechanism of the type referred to and wherein means are present forarresting the operation thereof.

when the supply of fuel to the engine or carbureter or other mixture produclng device is interrupted or materiall reduced in amount, as by a float controlled valve, a governor,"or other element provided for regulating the amount of fuel supplied to the engine; the operation of the said pumping mechanism arresting means being dependent upon the rise in pressure in the fuel being pumped whichfollows the interruption or restriction of the supply thereof to the engine or to'the combustible mixture producing device employed.

A further object of my provide improved means for arresting the ing mechanism when the flow 0 through a conduit throughwhich fuel for use in the engine flows therefrom, i's ar-' rested in whole or to a substantial extent; said means including .a fuel reservoir glib which the fuel is discharged by said p ping mechanism, and means the operation of whichis dependent upon a rise in presinvention is to sure within said fuel reservoir for interrupting the operation of said pumping mechanism to supply fuel thereto.

With the above and other objects in view my invention consists in the improve liquid fuel supply device for internal combustion engines illustrated in. the accoming specification, and particularly claimed, and in such variations and modifications thereof as will be obvious to those skilled in the art to which my invention relates.

In the drawings accompanying and formpanying drawing, described in the *following a part of this specification and wherein the preferred embodiment of my invention is illustrated:

Figure 1 is a view showing my improved fuel supply device in section, the same being shown as employed to supply fuel to the float chamber of a carbureter whereby the engine is supplied with a combustible mixture of air and a hydrocarbon;

Fig. 2 is a view showing a section upon a transverse plane indicated by the line 2-2, Fig. 1;

Fig. 3 is a sectional view similar to Fig. 1 but showing a modified form of pumping mechanism, the device whereby the fuel pumped by said mechanism is supplied to thed engine cylinder not being illustrated, an

Figs. 4:, 5, and 6 are views similar to Fig. 3 but showing modifications.

Referring now to the drawings the reference numeral 5, Fig. 1, designates the cylinder of an internal combustion engine, 6

the piston thereof, and 7 a normally open outlet passage through which gas under pressure may flow from the interior of the cylinder through a conduit 8 to my im-' 3 proved fuel feeding device; such flow or at least the greater part thereof occurring near the end of the compression stroke and early in the working stroke of the piston of the engine when the pressure within the cylin- 'der the. highest, as will be understood. The outlet from the cylinder is permanently open so that gas may flow from the interior of the cylinder whenever the pressure, therein is sufficiently high, although a needle valve 9 is preferably provided in order tore ate thellow. of gas from the engine cy der.

The mechanism immediately concerned with the feeding of the fuel in my improved.

vided by a casing of any suitable form,-but

which casing is shown as comprising a cy lindrical shell 12 one end of which is closed by a head 13 having a peripheral flange 14, whereby the casing may be secured to a suit able support; and the other end of which shell is closed by a yieldable diaphragm 15 which forms a part of the wall of the casing; the said diaphragm being held in place against a circumferentially extending shoulder or ledge 16 by means of a head 17 shown as having one or more openings 18, so that one side of the diaphragm is always exposed to the pressure of the atmosphere while the other side thereof is exposed to the pressure within the fuel reservoir.

1 Associated with the fuel reservoir afore said and shown as extending through or across the casing 12 is a tube 19, the ends of which are secured in oppositely located openings in the wall thereof, and which tube orms apermanent part of and is permanently secured in place relative to the easing. The upper end of this tube is closed by a head 20 in threaded engagement therewith, and this head supports a cylinder 21 depending into the tube 19; so that the cylinder may be defined as supported by or from the casing and located within or extending thereinto, although a small part of the interior of the cylinder is in fact within the head 20 in the embodiment of my inven 'tion illustrated in Fig. 1. The open lower end of the cylinder is closed by a head 22 having a depending pipe 23 of less diameter than and which extends to, the lower head 24 of the tube 19, and there communicates withsthe discharge end of an inlet conduit 25 connected with said head, and which conduit leads from a suit-able fuel storage tank not shown,

The lower end of the cylinder 21 is provided with a flange 26 the periphery of which forms a tight fit withthe inner surface of the tube19, whereby a leak chamber 27 is provided between the said cylinder and the tube 19 the upper end of which is in communication with the atmosphere through a passage 28 in the head 20, and one or more .holes29 are rovided in the wall of said cylinder throug which any gas which may leak past the piston 38 may escape into the chamber-27 and pass to theexternal atmosphere.

The concentric arrangement, ofthe tube 19'and the pipe 23, and the fact that the lower end of said pipe forms a tightjoint.

or connection, as by means of a conical joint at 30, with the end. of thefuel supply conduit 25, provides an intermediate trap chainber 31 into which the fuel is, forced from the cylinder 21 through discharge passages trained in the s'tream'of fuel will collectwithin the said chamber, instead of passing into the fuel reservoir along with the fuel and therefrom to the engine.

The flow of fuel through the fuel supply conduit provided by the conduit 25 and the pipe 23 into the cyllnder 21 takes place past an inlet-supply check valve 34, and the fuel discharged into the trap chamber 31 as aforesaid flows therefrom and into the fuel reservoir 11 through a normally open discharge passage 35. This passage, however, is adapted to be closed to thereby prevent a further flow of fuel into the fuel reservoir by a spring operated valve 36, which valve is controlled by and held off its ,seat 37 by the yieldable diaphragm 15; but which valve will close onto its seat 37 and interrupt the flow of fuel through the discharge passage aforesaid when the diaphragm moves to the right, Fig.1, due to a rise of pressure Within the fuel reservoir.

The inner surface or wall of the cylinder 21 as hereinbefore explained is shown as extending into the head 20, and the reference numeral 38 designates a cup-shaped piston operating within the said cylinder and whereby a motor chamber 39 is provided at the upper end of the said cylinder, and a pumping chamber 40 at the lower end thereof. A spring 42 operates between the head 22 and the closed upper end of the piston 38 and acts to force. said piston upward, .or toward the motor chamber 39, and gas underpressure flowing through the gas pressure supply conduit 8 flows into and out from the motor chamber 39 through a pas- ,sage 41 in the head 20; thereby operating the gas operated pumping mechanism provided by the cylinder and piston, and the valve controlled inlet and outlet passages associated with the pump chamber 40, as will be appreciated.

- The diaphragm 15 acts to hold the valve 36 i in the normal'open position in which it is shown to which end said valve is provided with a'ste'm 43, the extremity'of which is in operative engagement with a plug 44 carried by a bushing 45 held in place in an ture flows to the engine through a mixture supply conduit 49. The said carbureter is shown as having a fuel reservoir within which a substantially uniform level of fuel is maintained as by a float 51 located therein, and which float closes a valve 52 with which it is operatively connected whenever the fuel rises above a predetermined level in the reservoir 50, thus arrestin the flow of fuel through the conduit 48 an into the fuel reservoir 50, as will be understood.

In view of the premises it will be appre ciated that the head 20 may be unscrewed from the upper end of the tube 19, which is ordinarily permanently secured in place in the walls 12 of the fuel reservoir 11; and the cylinder 21 carried by. said head, the head 22 at the lower end of said cylinder together with the inlet and discharge valves of the pumping chamber.40, and the depending fuel inlet pipe 23 all removed from the tube 19 as a single unitary structure;

thus providing a construction in which the greater part of the operating elements of the device may be assembled as a unitary structure or mechanism apart from the other resistance of the said spring being such that ficlent to bring about the closing of the said elements thereof, and then readily placed in operative relation with such other ele-' ments; and as readily removed from the tube in which they 'are located for inspec-' tion, re-adjustment or repair, should such a course be necessary or desirable.

The operation of the form of my inven-' tion illustrated in Fig. 1 is substantially as follows: When the engine with which the device is used is in operation gas under pressure will flow from the cylinder 5' through thegas pressure supply condu1t 8 and into the motor chamber 39 of the cylinder 21, thus forcing the piston 38 downward against the action of the spring 41; the

movement; of the pumping piston 38, thesaid spring acting to .return the pumping piston-into its uppermost position and produf'qe a flow of gas along the conduit 8 toward-the engine cylinder when the pressure therein is low, as during-the exhaust, suc- 1 tion, and throughout the greater part if not all of the compression strokes of the engine piston.

parted to the piston 38 induces a flow of liquid fuel into the pumping chamber 40 through the fuel supply conduit 25 and the pipe 23, and past the inlet valve 34'; which fuel is forced from the said pumping chamber past the outlet valve 33 into the trap chamber 31, and from said chamber through the passage 35 and past the normally open valve 36 and into the fuel reservoir 11.

The liquid fuel will be forced into the fuel reservoir 11 against the back pressure of whatever air or gas may be present therein, and the level of the fuel within said reservoir will obviously depend upon the vertical position or location of said reservoir relative to the carbureter or other fuel supplying device to which the liquid fuel is supplied through the fuel outlet conduit 48 leading thereto; the preferred arrangement of the fuel reservoir and the device which is supplied with fuel therefrom being such that the pressure within the said reservoir will be sufiicient to produce a supply of fuel under pressure to the .device which supplies fuel to the engine, in order to insure a prompt and adequate supply of fuel for the neegs of the engine with which the device is use The operation above explained will continue as long as the engine remains in operation, and until the flow of liquid fuel through the outlet conduit 48 is arrested or substantially reduced in amount by the closingof the valve 52, or otherwise in other forms of device for supplying fuel to the engine. a When, however, the flow of fuel along the said conduit is arrested or materially restricted the pressure within the fuel reservoir 11 will rise, the diaphragm 15 will be forced to the right against the action of the, spring 46, and the normally open valve 36 will be permitted to close onto its seat, thus interrupting the flow of fuel along the passage 35 and mto the fuel reservoir; the valve 36 and the yieldable diaphragm thus providing means the operation of which is dependent upon a rise of pressure within the fuel'reservoir for limiting the rise of pressure which wouldoccur therein when the flow of fuel through the outlet conduit 48 is interrupted or reduced to an-extent sufvalve, should the pumping mechanism continue to operate after the flow through said conduit 48 is reduced or arrested as aforesaid. The liquid thus trapped within the trap chamber 31 and the pumping chamber "40' will, prevent downward movement of the piston 38, thus suspending the supply of fuel to the fuel reservoir 11..

It will be appreciated that although the rise in pressure within the fuel reservoir is limited in the manner above explained the operation above outlined will build up a conduit 48.

The degree or extent of the rise in pressure which occurs within the fuel reservoir when the flow through the outlet conduit is interrupted is regulated by the spring 46 and cup 47 in engagement therewith; it being obvious that the greater the resistance of the spring the greater will be the rise in pressure within the fuel reservoir necessary to move the diaphragm away from the stem of the valve 36, so that the said valve may move into engagement with its seat and thus arrest the flow of fuel into the fuel reservoir.

In, the modified form of my invention illustrated in Fig. 3 the piston 53 operates in a cylinder 54 located within a fuel reservoir 55 having a diaphragm 56 substantially as in the form of my invention illustrated in Fig. 1; the piston being forced upward by a spring 57, the liquid fuel entering the pumping chamber 58 through a passage 59 having a check valve 60, and the same passing from the pumping chamber through a passage 61 controlled by a s ring closed check valve 62. The flow of uel into thepumping chamber takes place past a' normally open valve 63 urged toward its seat.

by a spring 64, but which valve is prevented from moving onto its seat by a bent lever 65 supported by a ball and socket or equivalent pivotal support, as shown at 66; the

lowerend of said lever being operatively connected with the valve 63 in any way as by a rounded head at the end thereof which enters a slot provided in the valveywhile.

the upper end of said lever is pressed against the diaphragm 56 by the spring 64.

7, When now the flow of fuel through the outlet conduit 48 is arrested or restricted the resulting rise of pressure within the res ervoir 55 will move the diaphragm 5'6 to the right and permit the spring 64 to close the valve 63, thus arresting the supply of fuel to the pumping chamber'and of course preventing a further supply of fuel to the fuel reservoir, the same as in the form of my invention illustrated in Fig. 1 so far as concerns the ultimate end or result secured.

Inthis form of my invention a' tube 67 is carried by the lower head of-the cylinder 54, and a bufi'er 68 is-located at the upper end of said tube and is pressed upwar a spring 69 housed within the tube. The piston 53 is provided with a depending wall 70 which engages the buffer 68 and cushions the piston at the end of the downward movement thereof, this being desirable especially when the valve 63 prevents the entry of fuel into the pumping chamber for any considerable number of strokes of the pis ton 53, as may occur when the device is in use.

In the embodiment of my invention illustrated in Fig. 4 the piston 71 moving Within the cylinder 72 draws liquid fuel into the pumping chamber 73 through the passage 74 and past the check valve 75 upon its up stroke caused by the spring 76, and forces such fuel past the check valve 77'and into the fuel reservoir 78 upon its down stroke, as will be appreciated. y

In this form of my device a bypass passage 79 communicates with the passage 74 below the valve 75, the outlet end of the said passage being normally closed by a valve 80 held against its seat by a spring 81, or by said spring acting in conjunction with the diaphragm 82; from which it follows that a rise in pressure within the fuel reservoir will open the valve 80 and permit fuel to flow from the said reservoir through the by-pass passage 79 and back to the inlet passage 74, thus preventing a further rise of pressure within the fuel reservoir, when the flow through the outlet conduit 48 is arrested or materially reduced in quantity.

In the forms of my invention hereinbefore explained the gas flowing to the pumping mechanism will act upon the upper end of the motor and pumping piston even though no fuel is being forced into the fuel reservoir. Fig. 5, however, illustrates a form of my invention in which the pressure within the motor chamber 83 is prevented from rising and thus subjecting the piston to pressure when the discharge of fuel from the fuel reservoir is arrested under the conditions hereinbefore explained; this end being accomplished by the use of abypass passage 84 leading from the motor chamber and the flow of, gas through which is normally prevented by an adjustable spring pressed and normally closed valve the pumping mechanism and *interrupting the supply of fuel to the will be appreciated.

fuel reservoir, as:

Fig. 6 illustrates a' form of invention in which the areaof the motor chamber 87 I is greater than that of the pumping cham her 88; the combined motor andlpumping piston having a larger head 89operating in a cylinder 90, and a plunger 91 operating in a cylinder 92 of reducedvdiameter.

The combined piston is forced upward by a spring 93 surrounding the plunger 91 and is therefore out of contact with the liquid fuel being pumped, and such gas as may leak past the piston head 89 passes to the atmosphere through holes 94.

'In this form of my invention the fuel" ply fuel to the fuel reservoir upon the hapnism; a permanently pening of the events hereinbefore explained may be suspended in any of the ways hereinbefore pointed out at length, the drawing shows a by-pass passage 99 leadingfrom the motor chamber 87 and through which gas may escape to the atmosphere upon a rise in pressure within the fuel reservoir 98; said by-pass being of the same kind, and controlled in the same way as the by-pass 84; employed in the form of my invention illustrated in Fig. 5, and hereinbefore described.

Reference is hereby made to my copending applications, Ser. Nos. 268,006, 335,648, 389,7 22 and 389,723, which include the subject matter disclosed, but not claimed herein.

Having thus described and explained my invention, I claim and desire to secure by Letters Patent 1. In a fuel feeding device of the class described, gas operated pumping mechanism; a closed fuel reservoir; a valve controlled fuel supply conduit through which fuel is supplied to said pumping mechanism; a valve controlled discharge passage leading from said pumping mechanism to said fuel reservoir; an outlet conduit leading from said fuel reservoir; and means the operation of which is dependent upon an increase in pressure within said fuel reservoir for limiting the rise in pressure therein which follows an interruption of the flow of fuel through said'outlet conduit.

2. In a fuel feeding device of the class described, gas operated pumping mechaopen gas supply conduit through which gas may flow to and from said pumping mechanism to operate the Y same; a closed fuel reservoir; a valve controlled fuel supply conduit" through which fuel is supplied to, said pumping mechanism;

a valve controlled discharge passage leading from saidpumping me'chanismto said fuel reservoir; an outlet conduit leading from said fuel reservoir and adapted to deliver fuel against varyin pressure; and means the operation of which is dependent fuel against retarding pressure; and

'ing outlet conduit leading from said fuel reserupon an increase in. pressure within said fuel reservoir. for limiting the rise in pressure therein which follows interruption of the flow of fuel through said outlet conduit.

3. In a fuel feeding device of the class described, gas operated pumping mechanism; a closed fuel reservoir; a valve controlled fuel supply conduit through which fuel is supplied to said pumping mechanism; a valve controlled discharge passage leading from said pumping mechanism to said fuel reservoir; an outlet conduit leading from said fuel reservoir and adapted to deliver fuel against varying pressure; and means the operation ofwhich is dependentupon an increase in pressure within said fuel reservoir for interrupting the operation of .said pumping mechanism to increase the amount of fuel within said fuel reservoir,

when the flow of fuel through said outlet conduit is arrested. 4

4. In a fuel feeding device of the class de- 1 scribed, gasoperated pumping mechanism; a closed fuel reservoir; a. valve controlled fuel supply conduit through which fuel is supplied to said pumping mechanism; a valve controlled discharge passage leading from said pumping mechanism to said fuel reservoir; an outlet conduit leading from said fuel reservoir and adapted to deliver fuel against varying pressure; and pressure operated means for limiting the rise of pressure within said fuel reservoir which follows arresting the flow of fuel through said outlet conduit.

5. In a fuel feeding device of the class described, gas operated pumping mechanism; a closed fuel reservoir; a valve controlled fuel supply conduit through which fuelis supplied to said pumping mechanism; a

'valvecontrolled discharge passage leading from said pumping mechanism to said fuel reservoir; an outlet conduit leading from said fuel reservoir and adapted to deliver pressure operated means for interrupting the operation of said pumping mechanism to mcrease the amount of fuel within said fuel reservoir, when the flow of fuel through said outlet conduit is retarded.

6. In a fuel feeding device of the class described, gas operated pumping mechamsm;

a-[closed fuel reservoir; a valve controlled fuel supply conduit for'supplying'fuel to said pumping mechanism; a valve controlle discharge passage leading from said pumpmechani'sm to said fuel .reservo1r;'an

voir and adapted to deliver fuel against retarding' pressure; and pressure operate means for limiting the pressure within said fuel reservoir.

7 in a fuel feeding scribed, a

I in said cylinder and whereby a motor cham;

device of the class d6; cylinder; a piston operating withher is provided at one end and a pump chamber at the other end thereof; a permanently open gas supply conduit through I reservoir; a valve controlled fuel supply conduit for supplying fuel to said pump chamber; a valve controlled discharge passage leading from said pump chamber to said fuel reservoir; an outlet conduit leading from said fuel reservoir and adapted to be subjected to pressure retarding the passage of fuel therethrough; and pressure operated means for limiting the pressure within said fuel reservoir.

8. In a fuel feeding device of the class described, a cylinder; a piston operating within said cylinderand whereby a motor chamber is provided at one end and a pump chamber at the other end thereof; a permanently open gas supply conduit through which gas may flow to and from said motor chamber; a spring for moving said piston toward said motor chamber; a closed fuel reservoir; a valve controlled fuel supply conduit for supplying fuel to said pump chamber; a valve'controlled discharge passage leading from said pump chamber to-said fuel reservoir; an outlet conduit leading from said fuel reservoir and adapted to deliver fuel against retarding pressure; and means the operation of which is dependent upon an increase in pressure within said fuel reservoir for limiting the rise of pressure therein which follows retarding the flow of fuel through said outlet conduit. v

9. In a fuel feeding device, a closed fuel reservoir adapted to contain a substantial quantity of liquid fuel with an air space thereover, a pump for supplying fuel to said reservoir, a fuel outlet conduit leading from said reservoir and adapted to be subjected to pressure retarding the delivery of fuel, and means operated by rise of pressure within the reservoir for limiting the rise of pressure therein which follows retardation of the flow of fuel through the outlet conduit, whereby the pressure within the reservoir may be kept within safe limits.

10. In a fuel feeding device of the" class described; a cylinder; a piston operating within said cylinder and whereby a motor chamber is provided at one end and a pump chamber at. the other end thereof; a permanently open gas supply conduit through which gas may flow to and from said motor chamben; a spring for moving said piston.

towardsaid motor'chamber; a closed fuel reservoir; a valve controlled fuel 'supply conduit for supplying fuel to said pump chamber; a valve controlled discharge passage leading from said pump chamber to the flow of fuel through said outlet conduit v is interrupted.

11. In a fuel feeding device of the class described, a cylinder; a piston operating within said cylinder and whereby a motor chamber is provided at one end and a pump chamber at the other end thereof; a permanently open gas supply conduit through which gas may flow to and from said motor chamber; a spring for moving said piston toward said motor chamber; a closed fuel reservoir; a valve controlled fuel supply conduit for supplying fuel to said pump chamber; a valve controlled discharge passage leading from said pump chamber to said fuel reservoir; an outlet conduit leading from said fuel reservoir; means for arresting the flow of fuel through said outlet conduit; a yieldable diaphragm exposed to the pressure within said fuel reservoir; and a normally open valve controlled by said diaphragm and adapted to arrest the flow of fuel from said pump chamber through the discharge passage aforesaid and into said fuel reservoir upon a rise of pressure within said reservoir.

12. In a fuel feeding device of the class described, a cylinder; a piston operating within said cylinder and whereby a motor chamber is provided at one end and a pump chamber at the other end thereof; a permanently open gas supply conduit through which gas may flow to and from said motor chamber; a spring for moving said piston toward-said motor chamber; a closed fuel reservoir; a valve controlled fuel' supply conduit. for supplying fuel to said pump chamber; a valve controlled discharge passage leading from said pump chamber to said fuel reservoir; an outlet conduit lead-' ing from said fuel reservoir; means for are resting the flow of fuel through said outlet conduit; a yieldable dia hragm exposed to the pressure within ,sai fuel reservoir; a

. valve normally held away from its seat by said diaphragm, and which valve is adapted to arrest the flow of fuel from said pump chamber. through the discharge passage aforesaid and into said fuel reservoir; and a spring for closing said valve onto its seat upon a movement of said diaphragm away therefrom, due to a rise of pressure within said fuel reservoir. I

13. In a fuel feeding device of the cyrss described, a closed casing whereby a uel reservoir is provided and thewall of which is formed in part by a yieldable diaphragm; a cylinder supported by said casing and extending within said cylinder and whereby a motor chamber is provided at one end and a pump chamber at the other end thereof; a gas supply conduit through which gas may flow into and out from said motor chamber; a spring for moving said piston toward said motor chamber; a valve controlled fuel supply conduit for supplying fuel to said pump thereinto; a piston operating chamber; a valve controlled passage leading from said pump chamber to said fuel reservoir and discharging thereinto an outlet conduit leadingfrom said fuel reservoir; means for controlling the flow of fuel through said outlet conduit; and means operated by said diaphragm for limiting the pressure within said fuel reservoir. 20

, 14. In a fuel feeding device of the class described, a closed casing whereby a fuel reservoir is provided and the wall of which fuel reservoir and discharging thereinto;

. is formed in part an outlet conduit leading from said fuel reservoir; means for arresting the flow of arrest the flow of fuel from said pump chamber through the discharge passage aforesaid and into said fuel reservoir upon a rise of pressure within said reservolr.

16. In a fuel feeding deviceof the class described, a closed casing whereby a fuel reservoir'is provided and the wall of whichis formed in'part by a yieldable diaphragm; a tube located within said casing; an inlet conduit communicating with sa1d tube; a-

removable cylinder located within said tube; a piston operating within said cylinder and whereby a motor chamber is provided at one end and a pump chamber at the other end thereof; a gas supply conduit through which gas may flow into and out from said motor chamber; aspring for moving said piston toward said motor chamber; a valve 1 controlled fuel supply passage through which fuel is supplied to said pump cham-- ber; a valve controlled passage leading from said pump chamber to said fuel reservoir and discharging'thereinto; an outlet conduit leading from said fuel reservoir; and a normally open valve controlled-by, said diaphragm and adapted to arrest the|fiow of fuel into said'fuel reservoir upon a rise of pressure therein.

17. In 'a fuel described, a closed casing reservoir is provided; a

place within said casing;

feeding device of the class whereby a fuel tube secured in an inlet conduit connected with said tube; a removable 'cylinder secured in place within aid tube and fuel through said outlet conduit; and means operated by said diaphragm for preventing a voir whenthe pressure therein rises to a V predetermined amount.

v 15. In a fuel feeding device of the class described, a closed casing whereby a ,fuel reservoir is provided and the wall of which a cylinder further supply of fuel to said fuel reserby a yieldable diaphragm; supported by said-casing and extending thereinto; a piston operating within said cylinder and whereby a motor chamber is provided at one end and a ber at the other .endthereof; a gas supply pump cham- I conduit through which. gas may flow into and out from said motor chamber; a spring for moving said piston toward said motor chamber; a valve controlled fuel supply conduit for supplying fuel to saidpump chamber; a valve controlled passage leading from said pump chamber to said fuel reservoir and discharging thereinto; an outlet scone duit leading from said fuel reservoir; means for arresting the flow of fuel through said outlet conduit; and a normally pen valve controlled by said diaphragm and adapted end of having a pipe smaller in diameter than said tube, and the end of which pipe forms a ti ht joint with the dischargeend of said in ct conduit; whereby a trap chamber is provided between said pipe and the interior of said tube; a piston operating within sa1d cylinder and whereby a motor chamber is provided trolling the supply of fuel through said pipeand into said-pump chamber; a valve controlled discharge passage leading from said pump chamber into said trap chamber; and a passage leading from said trap chamber into said fuel reservoir.

at one end and a pump chamber at the other end thereof; a valve for con-v 18. In a fuel feeding device of the class described, a closed casing whereby a fuel reservoir is provided and the wall of which is'formed in part bya yieldable diaphragm; a tube secured in (place in oppositely located openings provide in the wall of said casing;

an inlet conduit connected with thjelower "end of said tube; a removable cylinder s e-' portion of said cured in place in the upper tube and having. a pipe smaller in diameter than said tube, and he "lower end of which chamber is provided between said pipe and the interior of said tube; a piston operating forms a tight joint with the discharge said inlet conduit, whereby trap within said cylinder and whereby a motor chamber is provided in the upper end andcharge passage leading from said pump chamber into said trap chamber; a passage leading from. said trap chamber into said fuel reservoir; anda normally open valve controlled by said diaphragm for interrupting the flow of fuel into said fuel reservoir upon a rise of pressure therein.

19. In a fuel feeding device of the class described, a closed casing whereby a fuel reservoir is provided and the wall of which is formed in part by a yieldable diaphragm; a tube secured in place in oppositely located openings provided in the wall of said casing; an inlet conduit connected with the lower end of said tube; a removable cylinder secured in place in the upper portion of said tube and having a pipe smaller in diameter than said tube and the lower end of which pipe forms a tight joint with the discharge end of said inlet conduit, whereby a trap chamber is provided between said pipe and the interior of said tube; a piston operating within said cylinder and whereby a motor chamber isprovided in the upper end and a pump chamber at the lower end thereof; a spring for moving said'piston toward said motor chamberfa valve for controlling the supply of fuel through said pipe and into said pump chamber; a valve controlled discharge passage leading from said pump chamber into 'said trap chamber; a passage leading from said trap chamber into said fuel reservoir; a valve normally held away from its seat by said diaphragm,

and which valve is adapted to arrest the 20. In a fuel feeding device of the class I described; a closed casing whereby a fuel 'reservoir is provided; a tube secured in place within said casing; an inlet, conduit connected with the lower end of said tube; a removable cylinder smaller in diameter than said tube and secured in place in the upper portion thereof, and having a flange at its lower end contacting with the interior of the tube, to thereby provide a leak chamber between said cylinder and tube, said cylinder having also a depending pipe smaller in diameter than said tube and the lower end of which pipe forms a tight joint with the discharge end of said inlet conduit whereby a trap chamber is provided between said pipe and the interior of said tube; a piston operating within said cylinder and whereby a motor chamber is provided at the upper end and a pump chamber at the lower end thereof; a valve for controlling the supply of fuel through said pipe and into-said pump chamber; a valve controlled discharge passage leading from said pump chamber into said trap chamber; and a passage leading from said trap chamber into said fuel reservoir.

In testimony whereof, I have signed my name to this specification this 30th day of January 1919.

HARULD C. SUEKERT. 

